| Henry I the Admirable | |
|---|---|
| Duke of Brunswick-Lüneburg | |
| Prince of Grubenhagen | |
| Reign | 1291–1322 |
| Successor | Henry II |
| Born | August 1267 |
| Died | 7 September 1322 Salzderhelden (today part of Einbeck) |
| Spouse | Agnes of Meissen |
| Issue | Elizabeth Otto Albert Adelaide Facie Agnes Henry II Frederick Adelheid Conrad Mechtild Ernest I William Richardis Margaret John I |
| House | Welf |
| Father | Albert I, Duke of Brunswick-Lüneburg |
| Mother | Adelheid of Montferrat |
Henry I (August 1267 – 7 September 1322), Duke of Brunswick-Lüneburg, called the Admirable (German: Heinrich der Wunderliche, Latin: Henricus Mirabilis), a member of the House of Welf, was the first ruler of the Principality of Grubenhagen from 1291 until his death.